Machine for forming helical channels



Sept. 11, 1928.

W. EISENBERG MACHINE FOR FORMING HELICAL CHANNELS Filed June 28, 1927INVB NTOR .Ewenbery A TTORNE Y Patented Sept. 11, 1928.

PATENT WILLIAM nrsiinnnne', or EvansvILLn, IunrAnA'.

MACHINE FOR FORMING HELICAL CHANNELS.

Application filed June as,

The main object of this invention is to provide a machine which isadapted to cut a helical channel or slot in a tubesleeveor other'similarpiece of material. The machine is adapted to rotate a spindle or mandrelslowly by means which may be varied. to form channels or grooves ofvarious pitch.-

Another object of this invention is to providea machinefor forminghelical grooves or channels in a piece of work mounted on a mandrel. ,Arack bar forming a part of the machine rotates a spindle slowly as therack bar is moved longitudinallyalongan in clined path with respect tothe axis of the spindle and may bevaried to cut channels or grooves ofdifferent pitch.

The above and other objects willbecome apparent in the description belowin which characters of reference refer to like-named parts in thedrawing. I l

' Referring briefly to the drawing, Figure 1 is a longitudinal sectionalelcvational view of the machine which is used for the cutting of helicalchannels.

' Figure 2 is a topplan view of the machine showing the spindle actuatorcarriage.

Y Figure 3 is a cross sectional view of the spindle actuator mechanismtaken on line 7 33 of Figure 2. v v Figure 4 is a cross sectionalviewtaken on line 4-4 of Figure 2 showing the clutch operating mechanismused for reversing the rotation of the spindle of the machine. V

Referring in detail to the drawing, the numeral 10 indicates the trackorguide i'ail of a lathe or similar machine upon which the entiredevice-disclosed in thisapplication is mounted, and reciprocatesthereon. A table 11 is slidably mounted on the rail and supports theentire device. At one position on the side of the frame of the latheadjacent the guide rail 10, a disk 12 is rotatably mounted. Near itsperiphery a stud 13 projects from the face of disk. This stud is engagedby an arm 14 whose opposite end is pivotally secured to an ear 15 whichis formed integrally with the table 11 and depends therefrom. It is tobe noted that thru rotation of the disk the table is reciprocated to andfro a distance equal to the throw of thECOIJIlQCting arm-14.

A pair of bearing blocks 16 and 17, aligned with each other risevertically from the table 11 near one end thereof. These blocks areprovided with aligned openings. In the opening of the block 17 a spindle18 is mount- 1927. Serial No. 202,065.

ed rotatablyi On one end ofthe spindle a chuck 20 is secured whichsupports one end of a mandrel 21 on which the work tobe operated upon,is secured. The opposite end of the mandrel is engaged on the centeringstud 22 of the tail stock 23, the latter being mount:

ed on the table of the device. The centering stud is lined on anadjustable spindle which is operated by a fluted. hand wheel 22. -Theopposite bearing block 16 has a shaft 19 rotatably mounted therein whichhas a bore eX-- tending from the middle to its outer end and theborereceives the end of the spindle, the V latter being rotatably mounted insaid bore. The end of the shaft has a gear wheel .24

secured thereto which is constantlyrotated in one direction by a sourceof power such as a chain of gears or the like, This gear 24-is not usedin the operation of indexing the work but is made part of theconstruction so the member 18 may, he continuously rotatedwhen theclutch cone 28 contacts with the element 27 if and when it shouldbe sodesired Another gear wheel 25isrotatably mounted on the spindle adjacentthe bearing 17. This gear has a split cone 26 projecting from its facewhich may be contracted so that -it binds upon the spindle -18andsecures the gear wheel 25 thereto, it being noted that the gear wheelis normally free and able'to rotate independently of the spindle The endof. he shaft 19 which has the loore provided therein is also providedwith'a split cone 27. The inclined surfaces of these cones convergetoward each other and both are adapted to engagethe surface ofthe'spin'dle to cause the gear wheels 24 or 25 to alternate- 1y rotatethe spindle 18. Acollar 28 encircles the spindle 18 between the conesand is provided with a conical seat at each end. This collar when urgedinto contact with either of the cones is adapted to cause any of thecones to bind to the spindle. This collar 28 has a fork 29 pivotallysecured thereto. The fork is supported on a pin 30 and is rotatablymounted thereon. Arms 31 and 32 extend horizontally in oppositedirections from the pivoted end of the fork. The arm 82 has afinger 33extending downwardly therefrom and the opposite arm has a similar finger34C suspended therefrom, both fingers being spaced apart from eachother. Be-

tween the fingers an upright stop is posivided. As the turntable 38 hasthe carriage v cone 27. y

or the other of the fingers and thereby shift the collar 28in onedirection or the other so that it binds one or the other of the cones tothe spindle.

A bracket 36 extends sidewise from the frame of the lathe and supports abed plate 3'1 on which a turn table 38 is rotatably mounted. This turntable has a stud formed on its underside which is centered in a recessformed in the bed plate, said stud serving as an axis of rotation forthe turntable. Arcuate slots-39are formedat diametrically oppositepositions in the turn table. .A bolt 40 is passed thru each slot and isengaged in the bed plate 37 and servesthepurpose of securing the turntable in placerigidly .on the bed plate. A rail 41 having dove-tai edsides is rigidly mounted onthe upper face of the turn table andserves asa guide for a movable carriage 42 which is slidable the entire length ofthe rail. A rack bar 43 is pivotally attached to the carriage and isslidably mounted on the table 11 and reciprocates thereon. The device isused for forming helical channels, grooves or ridges on metal or otherwork. Whenthe rail41 is set to extend in a parallel direction to thelathe, the mechanism is neutral and will not course a helical path infront of a milling cutter. When the turntable 38 is rotated so that therail 41 extends-angularly away from the table 11, a

rotational movement of the mandrel is pro 42 slidably mounted thereon,and the car riage movesand reciprocates with the table 11, the carriagethereby movinrr nearer to and farther away from the lathe 1n this mannerreciprocating the rack bar 43, andas the latter is in engagement withthe gearwheel 25, this gear is rotated. At the time that the gear isbeing rotated, the cone 26 projecting from its face binds on the spindle181mtil'the finger 34 by: coming intocontactwith .the stop reverses orshifts thecollar 28- so that it releases the cone 26 and, binds the Itis a be ad that eertain changes in form and-construction may be madevwithout departing from the spirit and scope of the invention I claim;'1. A machine tor cutting helical channels comprisingareciprocatingtable, means for reciprocating said table, a rotatable turntable beside the first-named table extending angularlyto the path oft-raveluof the turn table, said turn table being mounted stationary, adoveatai ledrail on said turntable,

a carriage 'slidable on said rail, said ear-V riage being movablewiththe table, a-spindle on said first-named table,a s lit canerotatablymounted loosely on sai spindle, a

gear rigid with the cone, said gear being adapted to be releasablylocked to said spindle at intervals, a-collarengaging said gear forlocking the latter to the spindle, and

means pivotally connected to said carriage for rotating the spindle aart of arevolution' when said carriage and ta leis simultaneous lyreciproca'ted.

2. A machine for cutting helical channels dle and having a conical seatat its end, said cone being adaptedto contact with said conicalseat ofsaid collar, said come being adapt-V ed to be compressed by said collarto cause engagement of said cone with said spindle, a rail on said turntable being secured angularly to the path of travel of said table, acarriage slidable on said" rail, a rack bar secured to said carriage andengaging the gear wheel,

and clutch means for locking; said cone rigid on the indie. y a

In testimony whereof I afilx my signature.

. WILLIAM EISENBERG.

